Toshiba Electronics Europe GmbH has increased its lineup of stepping motor driver ICs with a new device that offers constant current motor control with no need for an external current sense resistor.
The new TB67S539FTG is contained in a 5mm x 5mm QFN32 package. It is ideal for a wide range of constant current control stepper motor applications, including those encountered in office automation, commercial and industrial equipment. The device is also ideal for use in surveillance cameras and projectors.
Based upon the company's latest BiCD process, the new product can drive bipolar stepping motors at voltages up to 40V and currents up to 2A. The integrated H-bridge circuit for motor control utilises an Nch/Nch configuration and has a built-in charge pump circuit for output stage control.
The current detector is combined within the QFN32 package, eliminating the requirement for an external current sense resistor. Also, the device does not need an external capacitor for the charge pump as it is also integrated. With this high level of integration, the demand for PCB space is dramatically reduced.
The output stage (covering the upper and lower transistor) has an RDS(ON) of only 0.8Ohm, assuring efficient operation and decreasing heat generation throughout use. When in sleep mode, the device draws a maximum current of 1µA.